Question: Simplify the appropriate Nvier - Stokes equation for the flow in a pipe assuming Vz = Vz ( r ) and gravity in the z

Simplify the appropriate Nvier-Stokes equation for the flow in a pipe assuming Vz=Vz(r) and gravity in the z-direction. The streamlines are assumed to be parallel to the pipe wall so that Vtheta=Vr=0
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